Low temperature plasma discharge power for surface treatment of polyethylene fiber

In this work, Non-thermal equilibrium plasma discharge power system using phase-shifted control ZCS PWM full- bridge inverter is proposed, it adopts transformer leakage inductance and primary inductance in series and parasitic capacitance of IGBT to achieve the zero-current switching and solve the current lag problem of IGBT.Using II network matching circuit,power supply will be effectively transmitted to the plasma. It is a efficient low-temperature plasma surface treatment systems suitable for a variety of materials. Practically polyethylene fiber was treated by atmospheric plasma glow discharge(APGD) followed by acrylic acid (AAc) grafting copolymerization. Plasma treated fiber surface characteristics such as wettability, morphological structure ,chemical composition and surface energy change were tested via contact angle measurements, SEM/EDS, ATR-FTIR and NMR. The involved treatment parameters were investigated systematically including gas atmosphere, plasma power, treating time, grafting rate etc. Investigations showed that treated fiber exhibited better hydrophilicity.